Railway hand brake



Oct. 5 1926.

' H. NORDENMALM ET AL RAILWAY HAND BRAKE Filed June 10. 1925 2 Sheets-Sheet 1 HH ll Oct. 5 1926. 1,602,084

H. NORDENMALM ET AL RAILWAY HANDBRAKE Filed June 10. 1925 2 Sheets-Shet 2 Patented Oct. 5, 1926.

UNITED. STATES 1,602,08 l PATENT OFFICE.

HJ'ALMAR NORDENMALM AND SOREN HANSSON, 0F. BUTLER, PENNSYLVANIA, AS-

SIGNORS TO AMERICAN RAILWAY PRODUCTS 00., INC., OF NEW YORK, N. Y., .A

CORPORATION OF NEW YORK.

RAILWAY HAND BRAKE.

Application filed June 10, 1925. Serial No. 36,083.

Our invention relates to a railway hand brake and particularly to a hand brake of the geared type employed to multiply the force applied by a brakeman to a brake hand wheel or lever.

Brakes are now in use in which a chain drum is connected to or operable by a gear which latter meshes with a pinion operable by the brake mast. It is desirable. to connect the brake member, such as the brake chain, to the chain drum in such a way as to move the same rapidly to take up the slack and then more slowly, that is, with greater force when the slack has been taken up and the brakes applied.

It is an object of the invention to provide a railway brake with a simple means to rapidly take up the slack in the brake member and then wind the same up more slowly.

It is another object to provide a geared railway brake with housing means for substantially completely enclosing the gear members to protect the same from the entry of foreign matter.

Other minor objects will appear as the specification proceeds.

Briefly stated, in the preferred form of the invention, we provide a frame to be secured to the car and in this frame are mounted a gear for actuating a chain drum, and a pinion. meshing with said gear and actuated by a hand heel or lever on the brake mast. A brake member, for example, a brake chain is connected to the chain drum in such a way that it may slide radially inwardly so that when the chain drum first begins to rotate, the slack will quickly'be taken up, since the point of connection is at a relatively great distance from the center of rotation and when the slack has been taken up, the brake chain will then move inwardly nearer the chain drum so that further rotation thereof will permit the chain to be wound up on the chain drum with consequent exertion of greater force than when the slack is being taken up.- The gears, if desired, may be housed in to prevent the entry of dust, water, etc.

In the drawings which show, for illustrative purposes only, preferred forms of the invention:

Fig. 1 is a top lan view in partial section of a brake embo ying features of the invention; 7

Fig. 2 is a side elevation of parts shown in Fig. 1;

Fig. 3 is a fragmentary central sectional view of the brake shown in Fig. 1;

Fig. 4 is a side elevation of a modified form;

Fig. 5 is a similar view of a further modification; p

Figs. 6, and 8 are diagrammatic views illustrating the operation of our chain drum device.

In the form shown in Figs. 1 to 3, 1 indicates a suitable frame having a yoke 2 extending therebelow. The upper side of the frame is preferably a plate 3 which forms the upper part of a housing as will be later described. The yoke 2 and upper or cover plate 3 may have ears apertured as at H for the reception of bolts for securing the brake frame in place on a car. The plate 3 is bored as at 5 and the lower part of the yoke is likewise bored at 6 to receive a shaft 7 which may be in the form of a headed bolt, the head of which is received in a depression in the platev 3 and the lower end may be provided with means such as a cotter pin 8 for securing the shaft in place. The shaft 7 forms a suitable bearing for the chain drum 9 uponwhich the chain or other brake member is wound as will be understood.

In the formshown, the chain drum 9 is provided with a top plate 10 having an upstanding annular flan e 11 thereon in which are formed gear teet 12-12 forming an internal gear integrally formed with the chain drum. As will be. clear, the internal gear and plate 10 form a shallow cup, the upper edge of which comes quite closely to the underside of the top plate 3 of the frame and, if desired, an overhanging lip 13 may be formed on the plate 3 so as to deflect dust and water out over the edge of the gear. The plate 3 and the internal gear cup thus form what may be termed a housing for the gear members whereby the latter are completely enclosed. If desired, the plate 10 may be provided with a drain a erture 14 for permitting any moisturewhic may accidentally get inside to drain out.

15 indicates a brake mast at the upper end plate 3 and is secured in a pinion 16 meshwitl the teeth on the internal gear pre viously described. If desired, the plate 8 may have a web or lug 17 for supporting the lower end of the brake mast and pinion 16.

The brake operating member, for example, a chain, is connected to the chain drum and is wound up thereon for setting the brakes on the car. V] e connect the brake operating member such as the chain 20 to the chain drum such a way that the chain is drawn up quickly so as to take out the slackand then the chain, slips in close to the chain drums so as to be wound up thereon and a a relatively slower speed than when the slack is being taken up.

In the particular form disclosed in Figs. 1 to 3, the lower plate 10, in this casel'orming a part of the internal gear, is provided with a substantially radial web or lug 18. which may carry a handlelike member or traveler 19, spaced from the flange 18 so asto permitthe end link oi". the chain 20 to slide along on said traveler radially of the drum. In

order to prevent the chain from rolling up upon itself during winding on the chain drum, we may provide a cam web 21 on the lower side of plate in the form of a helical cam,.so as to cause the chain to progress along axially of the chain drum as the latter rotates. V

The operation will now be described by particular reference to Figs. 6, 7 and 8. The chain drum 9 is in the position shown in Fig. 6 when the brakes are off and the chain will be slack. It is also to be noted that in Fig. 6 the "chain 20 connects to the traveler 19 at its outer end and radially relatively 'far from the chain drum. Now when the chain druni'9 is rotated to the position substantially as shown in F ig. 7 the chain 20 has moved a distance substantially equal to the radius extending from the center or" the chain drum to the outer end of the member 19 and this during only a quarter of a revolution of the chain drum. This quarter turn quickly takes up the slack in the chain 20 and when the drum 9 is moved slightly farther than as shown in Fig. 7, the chain 20 will immediately slide inwardly on the traveler 19 so as to occupy the position as shown in Fig. 7. Further rotation then or" the chain drum will cause the chain to move more slowly, and still further "rotation will wind the chain up on the druni9 until with the parts as substantially shown in Fig. 8, the brakes would be applied.

It will thus be seen that by the means dis closed, the slack in the chain is taken up by a qdlCX movement and with a relatively small rotation, say one-quarter of the turn of the chain drum. During the'neXt half revolution the chain is wound up until the brakes are i applied. This half rotation moves the chain relatively slowly and consequently tl e pull on the chain is greater than l when the slack is being taken. up. The pull whi i may be put on the chainby the brakeman when the chain is near-the drum as shown in Figs. 7 and 8 is of course much greater than when the slack is being taken up as shown in Fig. 6.

With the form of the invention shown in Fi s 1 to 3, the gear ratio or the gear and pinion is about 4: to 1 so that one revolution of the pinion'c'auses but a quarter of a revolution of the internal gear and consequentl but a quarter of arev'olution or the-chain drum; fhisgear ratio may,o1"' course, he changed't'o vary the multiplication of t e force applied by the brakeman; It is'tobe noted, howeve'rfth'at with a a to 1' gear ratio, the slack will be substantially takenup with a quarter revolutionor" the chain drum or, what is the same thing, one full revolution thebrake m'ast p in the'i 'orin of the "invention shown in' Figf h'25 indicates a frame to be attached to a car and this tr'a'niemay carry a shaft 26 on which the chain drum 2? may be'inounted, In this form, asin the previous case, the chain drurn Q'? maybe integrally formed with the gear 28 and theflange 'QQcarrying the traveler 1 V i .1 mast 15 is secured in a pinion 29 meshing with the gear 28 and it will be obs :Ved that the mast 15 and shaft 26 are at a substantial angle to each other, say degrees, and the gears 2829 consequently are bevelgears. jlhis construction is advantageous. in that situations sometimes arise which require the brakemechanisnitobe placed in a relativelyrestricted space and this angular arrange ment permits installation in suchrestricted space. The operation substantially the sainefas'that described in the previous form. In the form shown in Fig. 5 the frame 30 carries the shaft 31 on which is mounted the chain drum 32 which in this-case also may beintegral with a spur gear 33 and flange 34 carrying the handle member 19. The brake mast 15 is secured to and serves to rotate the spur pinion 34 which meshes with the spur gear 33. The operation of this form of the invention is the same as previously described. The construction shown in Fig. 5, while op'eratingto produce substantially the same result as the form shown in F ig. 4-, requires considerably more space and in some situations cannot be used for that reason; Y

ll fhile the invention has been described in detail and several forms shown, we do not wish to be limited to the constructions shown, since they are but illustrative and the invention may be embodied in other forms and the principles employed in various structural forms. Vi e wish to lay particuill) lar stress, however, upon means for quickly taking up the slack in the brake operating chain and also upon the housing of the gear members to protect the same.

We claim:

1. In a railway hand brake, a frame, a pinion for coaction with a brake mast, a

' gear meshing with said pinion, a chain drum carried by said gear, a chain connection comprising a traveler on said chain drum and extending radially thereof, a brake chain having its end link mounted to slide on said traveler radially of the chain drum, whereby when the chain is at the outer end of said traveler and the chain drum is rotated the chain will move rapidly to quickly take up slack and when at the inner end of said traveler will move more slowly and powerfully. 2. In a railway brake, a frame, a gear mounted on the frame and carrying a chain drum, a pinion meshing with said gear, means carried by said chain drum for receiving a brake chain, said brake chain being mounted for radial movement relatively to said chain drum. whereby when the latter is rotated the brake chain may first move rapidly on a long radius and then slide inwardly radially and move Slower as the chain drum is rotated.

3. In a railway brake, a rotatable .chain rum, means for rotating same, means for connecting a chain to said chain drum and permitting radial movement of the chain relatively to said chain drum, whereby when the chain is connected at a relatively great radial distance from the chain drum the chain will move rapidly and when the point of connection is radially inwardly the chain will move more slowly, and a cam member rotatable with said drum for preventing the substantially enclosed, .a chain drum connected to said gear, one of said two last mentioned members having a radially extending flange with means to receive a chain and permit radial movement of the chain thereon for the purpose described.

5. In a'railway brake. a frame, a gear carried by said frame, a pinion meshing with said gear for operating the same, a flange on said gear and extending radially, a member carried by said flange and spaced therefrom and extending radially of the gear for connection to a brake chain for the purpose described.

6. The combination defined in claim 5, and cam means for preventing the brake chain connected to said gear from rolling up upon itself.

HJALMAR NORDENMALM. SOB-EN HANSSON. 

